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Authors
Feng, Xuping
Peng, Cheng
Chen, Yue
Liu, Xiaodan
Feng, Xujun
He, Yong
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Article History
Received: 13 July 2017
Accepted: 8 November 2017
First Online: 21 November 2017
Competing Interests
: The authors declare that they have no competing interests.
